Composite ringing apparatus



H. S. OSBORNE.

comosnz memo APPARATUS.

APPLICATION FILED AMA; NIB.

1,313,41 3 Patented Aug. 19, 1919.

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mmvrogm H .5. Osbarne &.2. 92L

A TTORNEY PATENT OFFICE.

HAROLD s. ossomm. or NEW ens, N. Y..

ASSIGNOB TO AMERICAN TELEPHONE AND TELEGRAPH CO ANY. A CORPORATION OF NEW YORK.

COMPOQITE RINGING API PABATUS.

Specification of Letters Intent.

Patented Aug. 19, 1919.

Application tiled Aut\st I, 1918. Serial No. 241,840.

To all whom it may concern Be it known that I, llanow S. OSBORNE rcsidin at New York, in the count oi New ork and State of New York, ave invented certain Improvements in Com posite Ringing Apparatus, of which the folowing is a specification.

This invention relates to transmission lines which are composited for telephone and telegraph service and more particularly to the signaling or ringing arrangements associated therewith.

It has often been found desirable to associate with a transmission line composited for both telephone and telegraph service arrangements for relaying ringin currentt.ransmitt.ed over the inc. and suc I arrangenients are particularly desirable for relaying ringing current about repeater elclnents included in a line. It has been found in practice that with fornwr relaying arrangements, the relayed ringing current would have a tendency to leak back over the telegraph conductors, which connect the two sections of 'the composited line independently of the relaying arrangements, and

cause the relaying arrangmments to become locked in a. working position, thereby causing a steady ring over the transmission line.

accordingly it is one of the objects of this invention to provide means for relaying rmgnig current. from one section of a transmission line to another sectionoi the same line or other lines and in associating with such rolayin means arrangements which will insure t in restoration to normal of the relaying means upon the cessation of the origina ringing current coming in over-the liuc. A further object consists in providin means for preventing the occurrence 0 false ringing over a transmission line connected tclcgraphically with sections of other lines when ringing current is being transmitted over such sections. Other and furthel' objects of the invention will be clear from the detailed description of the operation to be given later.

In the arrangements of this invention the ringing current coming in over alias is 1 applied to the relaying means over 0onductors bridged across conductors leading to the line and to the network adapted for balancin the line. Th relayed ringing current i in turn applied to the connecting points of conductors leading to the outgoing line and to a network adapted for balancing such a line. The two networks are interconnected by conductors having an impedance equal to that of the telegraph conductorswhich interconnect the two lines. By the above arrangements any of the relayed ringing current, which leaks back over the telegraph conductors to the incoming line an 1 the conductors connected thereto. will be p )osed by an equal and opposite current. which ..leaks back over the conductors interconnecting the networks and which tends to produce a potential equal and opposite thereto. These currents will accordingly neutralize each other and have no effect on the relaying arrangements. If itis desired to employ the arrangements of this invention on a line including a. twowaytwo-element repeater, the relaying means may be connected to conductors 00nnccted to the input windin of the repeaters, and the relayed ringing current applied to the mid-points of such windings and the networks connected as formerly pointed out. The output circuits of the repeaters .are also associated with the-mid-points of these windings for purposes of balance. However. it will be understood that the arrangements of this invention are adapted for use \vith liucs connected telephonically by apparatus other than repeaters.

The invention may be more fully understood with reference to the accompanyin drawingin the figure of which is illustrated a preferred form of the circuit arrangemeats of the invention. For purposes of convenience th' relaying arrangements have been illustrated as associated with the cord circuit A inclyding the repeater elements R and R an adapted for interconnecti the lines L L and L although it w be understood that-the arran ments of the invention might equal] wel be associated with a two-we two-e ement repeater d1? rectly :connec meansz for connecting the lines tel 'homcally. The repeater elements R, 3d R, are shown as of the mechanical type sl-" though other types such as the vacuum an repeater may be emplo ed. Associated '1 the lines L L L an L 1 lines or networ s N 1i. and N ads. tedto ba ance the lines resp ctively. inhemy to the lines,.or with other 10o L and L, are connected for telegraph purposes by the conductors 31 and 32 in w iich are included the 'inductances 35 and 36 which olfer a high impedance to telephone currents but do not interfere with the trans mission of telegraph currents. The networks N, and N, are interconnected by conductors 33 and 34 in which are included the incluctances 37 and 38 which are similar to'inductances- 35 and 36. Included in the lines L and L, are the condensers 41 and I 42, and 44 and 45, which prevent telegraph tion is made' by plug P currents from being transmitted to the to phone aiparatus connecting the lines, but which '0 not hinder the trunslnission of telephone currents thereto. Bridged across the lines L, and L are the inducta-nces 43 and 46 each havin a tap to ground. These inductances are 0 high impedance to telephone currents but are of low im edaiice to telegraph currents and according y serve to shunt to ground any telegraph currents which may pass through the condensers 1, 42, 44 3and Associatedl withhthe repeaters 1 an respective y are t e input windin 5 and 6, and 7 and 8. Bridged across t e conductors 9 and 10, and 11 and 12 which are connected to the windings 5 and 6 is the ringing relay 2 which responds to ringin current comm 'in over a line with whic a connection is made by plug P Under the control of relay 2 is the relay 4 which serves to apply ringing current from the source 40 to the mid-points of windings? and 8 and thence out over a line with which a connection is made by. plug P, Bridged across the conductors 22 and 23 and 21 and 24, which are connected to the windings 7 and 8 is the ringing re-t lay 3 which responds to ringing current coming in over a line with which a connec- Under the controlof relay 3 is the relay 1 which serves, to ap ly ringing current from the source 39 tot emid-points of windin 5 and 6 and thence out over a. line with WHllCh a connec-' tion is made by lug P,. Associated with the midoints bi windings of 5 and Why means 0 conductors 151ml 16 and transformer B8 is the out )ut circuit of repeater R Associated witi the mid-points of windings-7 and B-by means of cimductors 27 and 28 and ti'ansforiiier 59 is theioutputacircuit of repeater B The 0 eration of the invention is as..f .llows: I the lines L, lind L are interconnected by the cord circult'A by insc rtin the plugs P and 1, into the jacks J, and ill-re; spectively, ringing current coming in over t e line twill be transmitted over the following circuit: from one side -of liiieL. upper tip iiontacta of jack J, and plug P conductor 0, conductor 52, lower winding of relay '2, conductor 53, condi'iotor 10. lower ring contactsof plug P, and jack J, through ground, contact and armature of relay 2,

conductor 20, winding of relay 4, to battery and ground. The openin of this circuit will decnergize relay 4 which will allow its armatures to retract and will thereby connect ground to conductor 25 leading to the mid-point of winding 7 and will connect. a source 40 of'ringing current to conductorilo leading to the mid-point of winding 8. At

the mid-point of windin r 8 the ringing current from source 40 wi divide, a poitioii thereof being transmitted out over line L as follows: from mid-point of winding 8,

lower 'coil of winding 8, conductor 24', lowerring contacts of plug and jack J out over the lower side 0 line L and back over the upper side of line L,, lower tip contacts of 'ack J and'plug 1 conductor 23, lower coi of winding 7 conductor 25 and'armature and contact of relay 4, to ground. The other portion of the ringin current from source 40 will be transmitter over artificial line N as follows: from mid-point of winding 8, upper coil of winding 8, conductor 21, upper tip contacts of plug 1?, and jack J artificial line N upper ring contacts of ack J, and plu P. conductor 22, upper coil of winding l, conductor 25, armature and contact of relay 4, to ground. The portion of the ringing current from source 40, which. is

.transmitted out over the line L,, may have u plug P and jack J artificial lino N. lower tip contacts of jack J, and plug l conductors l1 and 51,upper windingof rel din-tors lit) and 12, upper ring contacts "of plug 'P and jack J lower Sltlthhf line L over telegrulph co iductor 32 to -the upper side of line 1,, However, at the same time, the other portion of the ringingcurrent froui'sourro 40, which diilided equally at the niid.-point,of winding 8 and was transmitted throughthe artificial line N would have a tendency to leak back over the telegraph conductors 33 and '84 and to the ringing relay 2. in the following-manner: over tolegra )h conductor 34, lower ringing contacts of ack J, and plug P conductors 10 and cord i ngl 53, Lmver whaling of relay 2, conductors 52 aml 9, upper tip contacts of )lug l and jack -lr out over the upper side of line L, and hack over the lower side of line L, upper ring contacts of jack J and plug l mcl conductors l2 and 50, upper \vinding'o relay .4, over conductors 51 and 11, lower tip contacts of plug 1, and jack J, and over tc cgrnph conductors 33. It will be seen that the direction of this last mentioned current, which has a tendency to leak back to the ringing relay 2, over the telegraph conductors 33 and 34 interconnecting the balancing networks, is directly op )osite to the direction of the current which has a tendency to leak back to the ringing relay 2 over the telegraph conductors 31 and 32, interconnect. ing the lines L and L,. As the ringing current from source 40 ori inallv divided equall at. the midmint 0 Win( in 8 and as eacr nation of tire current 'Dlllt be at= tenuatet equally by the inductanees 35, 36 and 37, 38, the two portions of the current would be equal and by tending to flow through the ringing relay 9 in opposite directions would neutralize each other and acwould cause no interference with the rirwlng relay 2.

In li c manner ringing current coming in over line L will operate the ringing relay 3, which in turn controls relay 1, whereby ringing current from source 39 will be applied to the mid-points of windings 5 and 6 and thence out over the line L, and the artificial line N A portion of the ringing current thus transmitted in relayed form out over the line L.,. may leak back over the telegraph conductors 31 and 32 to the line L and to the ringing relay 8. However, this current would be neutralized by an equal current which would tend to leak back over the telegraph conductors 33 and 34 and would tend to flow through the ringing relay 3 in an opposite direction and accordingly cause no interference with the ringing relay 3. As the o ration would be similar to that reviously eacribed with respect to ringing current coming in over the line L no further description thereof will be given.

If a connection should be made between the lines L, and L,, and at the same time a connection be made between the lines L, and T1,. with cord circuits or arrangements emloying former types of relaying means for ringing current. it will be seen that the relnyud ringing current transmitted out over the. line L might leak back over the telegraph conductors 31 and 82 to the line L, and actuate the relayin means interconnecting the. lines L, and and accordingly cause a false ring to result over line L,. However if the lines L, and L, and the line; L, and L, are. interconnected by cord circuits, such as the cord circuit A, or with would other arrangements employing the, relaying means of this invention, the possibilit of relayed ringin r current leaking back roin line L, to line it, over oonductors 31 and 32, and operating the relaying means in the cord circuit interconnecting lines L, and L will be obviated. as such ringing current would be neutralized in the cord circuit interconnra-ting lines L and L, by an equal current leaking back over conductors 33 and 34 and tending to How through the relaying means in an o) )osite direction. As the description of tin; operation would be substantially the same as has previously been given, a further description of the circuits will he omit-ted.

While the arrangements of this invention have been illustrated as embodied in certain specific -arran unents which have been deemed desirab c, it will be understood that they are capable of embodimentin many an widely varied forms without dc iarting from the spiritof the invention as de wed in the appended claims.

What is claimed is:

1. A plurality of transmission lines, networks for balancing said lines, means to connect said lines and nreans to connect said networks for telegraph purposes, means to connect said lines telephonieally including \r'indings associated with one of said lineS arrdnetworks and windings associated with another of said lines and networks, a source of current, and means associated with one. set of said windings and responsive to current coming in over the line associated therewith for applying current from said source to the mid-mints of said other set' of windings.

2. A telephone repeater system com-prising two line. sections, repeaters connecting said line sections, a normally disconnected source of ringing current a sociated with said repeaters, and means res onsive to ringing current received over eit er line section to connect said source of ringing current to the mid-points'offthe repeater input wind- 8. A plurality, of transmrssion l nes, artificial lines for balancing said lines, means for connecting said lines and means for connecting said artificial lines for telegraph p means for connecting said lines telephomeally, a source of current and means associated with conductors leading to one of said transmission lines and its artificial line and res onsive to current coming in over said line or applying current from said source to the connecting points of another of said transmission lines and its artificial line.

4.'A plurality of transmission lines, networks for balancing said lines, means to connect acid lines and means to connect aid networks for signaling per sec, means to connect said liner tel p on cally mcludw in the mid-points of Slliki other 3M nf windings.

In testimony whereof I haw signml my H name in this specification thi sixteenth (lay of July 1918.

HAROLD S. OSBORNE. 

